Phenyl-n-(1-alkenyl)-n-methylcarbamates

ABSTRACT

New phenyl-N-(1-alkenyl)-N-methylcarbamates and their use as insecticides.

D United States Patent 1 1 1111 3,888,903

Chupp June 10, 1975 [54] PHENYL-N-(l-ALKENYL)-N- 3,131,215 4/1964 Lemin 260/479 C METHYLCARBAMATES 3,637,810 l/1972 Ulrich 260/479 C 3,701,807 10/1972 Chupp 260/468 E Inventor: Joh au C pp, Klrkwood, 3,829,482 8/1974 Mueller et a1 260/479 c x [73] Assignee: Monsanto Company, St. Louis, Mo. FOREIGN'PATENTS OR APPLICATIONS [22] Filed: June 21, 1973 15,250 9/1954 Germany 260/479 44-4541 2/1969 Japan 260/468 E [21] Appl. No.: 372,434

OTHER PUBLICATIONS Related US. Application Data h C A 3 [62] Division of Set. No. 20,044, March 16, 1970, Pat. Hoe 301362 (1936) No. 3,764,691 Staurouskaya et al., Chem. Abst., 72:89722u, (1970).

[52] US. Cl. 260/468 E; 260/479 C Primary Exami nerAnton 1-1. Sutto [51] Int. Cl. C07c 125/06 Assistant Examiner-Michae1 Shippen [58] Field of Search 260/468 E, 479 C Attorney, Agent, or Firm-John L. Young [56] References Cited 57 I ABSTRACT UNITED STATES PATENTS New pheny1 N-(l-alkenyl)-N-methylcarbamates and 2,416,068 2/ 1947 Schweitzer 260/468 E their use as insecticides 2,592,254 4/1952 Dickey 260/479 C 3,084,096 4/1963 Lambrech 260/468 E 10 Claims, No Drawings PHENYL-N-(l-ALKENYL)-N- METHYLCARBAMATES This is a division, of application Ser. No. 20,044, filed Mar. 16, 1970, now US. Pat. No. 3,764,695.

This invention relates to new and novel phenyl-N-( lalkenyl)-N-methylcarbamates, which are useful as biocides and particularly as insecticides. This invention also relates to insecticidal compositions and to methods of combatting insects.

The novel phenyl-N-( l-alkenyl)-N- methylcarbamates can be represented by the formula CH 1 n l R O C N C R R3 R2 wherein R is alkyl or alkylamino of a maximum of 6 carbon atoms, R, R and R are hydrogen or alkyl or a maximum of 4 carbon atoms, R and R can together form an alkylene group of 3 through 6 carbon atoms, and n is an integer from 0 through 2.

The term alkenyl as used herein encompasses acyclic as well as cyclic alkenyl groups. When both R and R in the above formula are hydrogen or alkyl, the compounds are acyclic. When R and R are combined, however, to form an alkylene group, the alkylene group together with the ethylene linkage combines to form a cycloalkenyl group having from through 8 carbon atoms.

In the above formula, the alkyl groups of R, R, R and R can be methyl, ethyl, n-propyl, secondary propyl, isopropyl, n-butyl, secondary butyl, tertiary butyl, isobutyl and the various forms of p entyl and hexyl, and R and R taken together can form the corresponding alkylene groups.

The N-acyclic alkenyl compounds of the present invention are readily prepared by reacting a carbamolychloride with a phenol or a phenoxide of an alkali metal (e.g., sodium, potassium, or ammonium) in accordance with the following general equation:

in which R, R R, R and n have the above identified significance. The reaction is normally conducted in an inert solvent such as diethyl ether at room temperature and goes to substantial completion in about to hours. The speed of the reaction can, of course, be materially increased at elevated temperatures. The temperature employed is not critical, and usually varies between room temperature and the boiling point of the particular solvent used. The carbamoylchloride employed in the above reaction can be prepared by the following methods. When preparing the phenyl-N- acyclic-alkenyl-N-methylcarbamates of the invention, an aldehyde is reacted with methyl amine and the product thereof treated with phosgene in accordance with the following general equation:

The carbamoylchlorides utilized in preparing the phenyl-N-cyclo-alkyenyl-N-methylcarbamates of this invention can be prepared by reacting an N-methyl-N- cycloalkylidine with phosgene as exemplified by the following reaction:

N-C-Cl cation, parts and percents are by weight unless otherwise indicated.

EXAMPLE 1 About grams of m-isopropylphenol and about 1500 ml. of dimethyl ether were charged into a suitable reaction vessel provided with an agitator, thermometer, and reflux means. After the addition of the phenol was complete, about 182 grams of a 25% solution of sodium methoxide was added dropwise with agitation. This resulted in the formation of the corresponding sodium phenoxide, and the methanol was distilled off. The reaction mixture was cooled to about room temperature, and about grams of N-(2-ethyl-l-butenyl)N- methylcarbamoylchloride was added. The reaction mixture was then refluxed for about 2 hours and permitted to remain at room temperature for about 72 hours. The salt was filtered off and the filtrate taken up in methylene chloride, washed with an aqueous sodium carbonate solution, and then washed twice with water.

l-butenyl)-N-methylcarbamate. This product gave the following analysis:

Calcd for: C I-[ 0 M Theory 74.14%C, 9.15%1-1, 5.09%N. Found 73.33%C, 9.02%1-1, 4.04%N.

EXAMPLE 2 About 12 grams of m-tolylchloroformate dissolved in about 100 ml. of benzene were added to a reaction vessel as described in the preceding example. Then about 8.5 grams of N-methyl-N-cyclohexylidene dissolved in about 50 mm. of benzene were added and the temperature of the reaction mixture maintained between about and C. The mixture was stirred for a period of about 5 minutes and then about 7.8 grams of triethylamine was added and the mixture heated at reflux for about 45 minutes. The mixture was cooled, filtered, and the filtrate washed with water, dried and the benzene removed under vacuum. The product thus obtained, m-tolyl-N-( cyclohexen- 1 -yl )-N methylcarbamate, was analyzed for C I-1 0 1, with the following results:

Theory 77.4%C, 8.16%1-1, 6.0%N. Found 75.52%C, 8.10%H, 5.48%N.

Other compounds made in general accordance with the procedures of the above examples include:

m-( l-methylbutyl) phenyl-N-( 1-isobuten-1-yl)-N- methylcarbamate m-( l-ethylpropyl) methylcarbamate m-(2-ethylpropyl) yl)methylcarbamate m-( l-methylbutyl) yl)methylcarbamate m-isopropylphenyl-N-( 2-ethyl- 1 -buten- 1 -yl )methylcarbamate phenyl-N-( 2-ethyl- 1 -butenl -yl)methylcarbamate m-isopropylphenyl-N-(isobuten-1-yl)methylcarbamate m-methylaminophenyl-N-( 1-isobuten-1-yl)methylcarbamate m-ethylaminophenyl-N-( 1 -isobutenl -yl))methylcarphenyl-N-( 1-isobuten-1-y1)-N- phenyl-N-(Z-ethyll -hexen-1- phenyl-N-( 2ethyl- 1 -hexenl bamate r m-hexylphenyl-N-(1-cycloocten-1-yl)-N- methylcarbamate m-ethylphenyl-N-( 1-cyclohepten-1-yl)-N- methylcarbamate m-tolyl-N-( l-cyclopenten-1-yl)-N-methylcarbamate m-dimethylamino-N-ethenyl-N-methylcarbamate The terms insect and insecticide are used herein in their broad common usage to include spiders, mites, ticks and like pests which are not in the strict biological sense classed as insects. Thus, the term insect is used to refer not only to those small invertebrate animals belonging mostly to the class lnsecta, comprising sixlegged, usually winged forms, as bettles, bugs, bees, flies, and so forth, but also to other allied classes of arthropods whose members are Wingless and usually have more than six legs, as spiders, mites, ticks, centipedes, millipedes, and wood lice.

The activity of these compounds against the corn rootworm is illustrated by the following:

To a growth pouch (diSPo Seed-Pak growth pouch, Catalogue No. B1220, of Scientific Products Division of American Hospital Supply Corporation, Evanston, 111.) in an upright position is added 20 ml. of distilled water. Thereafter is added 0.1 ml. of an acetone solution of known concentration in percent by weight of a compound of this invention (for example an 0.1 ml. of an 0.1% by weight acetone solution of the compound provides a concentration of 5.0 ppm. thereof while 0.1 ml. of an 0.02% by weight acetone solution of the said compound provides a concentration of 1.0 ppm thereof). In the trough of the pouch formed by the paper wick thereof is placed two corn seeds (Zea mays, Hybrid US. 13) about one inch apart. Thereupon to the trough and between the seeds is added 8 to 12 ready-to-hatch eggs of the southern corn rootworm (Diabrotica undecimpuncrata howardi), which eggs were washed (with distilled water) free of the soil in which they were incubated at room temperature for 21 days immediately prior to their placement in the trough. The socharged growth pouch is then placed in an upright position in an incubator maintained at F and 70% relative humidity for 14 days. Immediately thereafter the growth pouches are removed and the extent of kill in percent of the particular species of corn rootworm larvae observed. At a concentration of 5 ppm., a kill was observed with misopropylphenyl-N-isobutenyl-N-methylcarbamate and also with m-isopropylphenyl-N-(2-ethyl-1-butenyl)-N- methylcarbamate. When used at the same concentration, a mixture of m-(1-methylbutyl)phenyl-N- isobutenyl-N-methylcarbamate and m-( 1- ethylpropyl)phenyl-N-isobutenyl-N-methylcarbamate gave a 60% kill. 7

To demonstrate the activity of the compounds of this invention against the western corn rootworm (Diabrotica virgifera), compounds were incorporated into separate portions of soil containing sections of corn roots. Each portion of the soil was then infested with 10-day old western corn root larvae and maintained at 25C and 70% relative humidity for 48 hours. At concentrations of 6 ppm., 100% kills were obtained with 1) m-tolyl-N-(1-cyclohexen-1-yl)-N- methylcarbamate, (2) m-isopropylphenyl-N-(2-ethyllbutenl -yl)-N-methylcarbamate, (3) m-tolyl-N( 1 cyclohexen-l-yl)-N-methylcarbamate, and (4) a mixture of m(l-methylbutyl) phenyl-N-(1-isobuten-l-yl)- N-methylcarbamate and m-(1-ethy1propyl)phenyl-N- 1-isobuten-l-yl)-N-methylcarbamate.

The compounds of the present invention are also quite effective against the boll weevil (Anthonomus grandis) and the bollworm (Heliothis zea). For example, when cotton fields are sprayed at the rate of ten pounds per acre with m-tolyl-N-( l-cyclohexenl -yl)-N- methylcarbamate, a 60% kill of the boll weevil is obtained. The same compound, when applied to leaves of cotton plants at a concentration of only 0.05%, resulted in a 60% kill of the bollworm.

The present compounds are also effective against the yellow fever mosquito (Aedes egypti). For example, 100% kills were obtained in a standard life cycle test with 2 ppm. of a mixture of m-( l-methylbutyl)phenyl- N-(1-isobuten-l-yl)-N-methylcarbamate and m-( lethylpropyl )phenyl-N-( 1-isobuten-1-yl)-N- methylcarbamate, 2 ppm. of a mixture of m-(2- ethylpropyl)phenyl-N-( 2-ethyl- 1 -hexen- 1 -yl)-N- methylcarbamate and m-(1-methylbutyl)phenyl-N-(2- ethyl-l-hexen-l-yl)-N-methylcarbamate and 0.2 ppm. of m-isopropylphenyl )-N-(2-ethyll -butenl -yl)-N- methylcarbamate.

Although the compounds of this invention are useful per se in controlling a wide variety of insect pests, it is preferable that they be supplied to the pests or to the environment of the pests in a dispersed form in a suitable extending agent.

The term dispersed is used herein in its widest possible sense. When it is said that the compounds of this invention are dispersed, it means that particles of the compounds may be molecular in size and held in true solution in a suitable organic solvent. It means further, that the particles may be colloidal in size and distributed throughout a liquid phase in the formof suspensions or emulsions or in the form of particles held in suspension by wetting agents. It also includes particles which are distributed in a semi-solid viscous carrier such as petrolatum or soap or other ointment base in which they may be actually dissolved in the semi-solid or held in suspension in the semi-solid with the aid of suitable wetting or emulsifying agents. The term dispersed also means that the particles may be mixed and distributed throughout a solid carrier providing a mixture in particulate form, eg pellets, granules, powders, or dusts. The term dispersed also includes mixtures which are suitable for use as aerosols including solutions, suspensions, or emulsions of the compounds of this invention in a carrier such as dichlorodifluoromethane and the like fluorochloroalkanes which boil below room temperature at atmospheric pressure.

The expression extending agent are used herein includes insecticidal adjuvants and any and all of the substances in which the compounds of this invention are dispersed. It includes, therefore, the solvents of a true solution, the liquid phase of suspensions, emulsions or aerosols, the semi-solid carrier of ointments and the solid phase of particulate solids, e.g. pellets, granules, dusts and powders.

The exact concentration of the compounds of this invention employed in combatting or controlling insect pests can vary considerably provided the required dosage (i.e., toxic or lethal amount) thereof is supplied to the pests or to the environment of the pests. When the extending agent is a liquid or mixture of liquids (e.g., as in solutions, suspensions, emulsions, or aerosols) the concentration of the active compound employed to supply the desired dosage generally will be in the range of 0.0001 to 50 percent by weight. When the extending agent is a semi-solid or solid, the concentration of the compound employed to supply the desired dosage generally will be in the range of 0.1 to 80 percent by weight. From a practical point of view, the manufacturer must supply the user with a concentrate in such form that, by merely mixing with water of solid extender (e.g. powdered clay or talc) or other low-cost material available to the user at the point of use, he will have an easily prepared insecticidal spray or particulate solid. In such a concentrate composition, the compound generally will be present in a concentration of 5 to 95 percent by weight, the residue being any one or more of the well-known insecticidal adjuvants, such as the various surface active agents (e.g. detergents, a soap or otheremulsifying or wetting agent), surfaceactive clays, solvents, diluents, carrier media, adhesives, spreading agents, humectants, and the like.

The compounds of this invention are preferably supplied to the insect pests or to the environment of the insect pests in the form of emulsions or suspensions. Emulsions or suspensions are prepared by dispersing the compounds either per se or in the form of an organic solution thereof in water with the aid of a watersoluble surfactant. The term surfactant as employed herein is used as in volume 11 of Schwartz, Perry and Berchs Surface Active Agents and Detergents (1958, Interscience Publishers Inc., New York) in place of the expression emulsifying agent to connote generically the various emulsifying agents," dispersing agents, wetting agents" and spreading agents that are adapted to be admixed with the active compounds of this invention in order to secure better wetting and spreading of the active ingredients in the water vehicle or carrier in which they are insoluble through lowering the surface tension of the water (see also Frear Chemistry of Insecticides, Fungicides and Herbicides," second edition, page 280). These surfactants include the well-known capillary-active substances which may be anionic, cationic, or non-ionic which are described in detail in volumes I and II of Schwartz, Perry and Berchs Surface Active Agents and Detergents (1958, Interscience Publishers, Inc., New York) and also in the November, 1947 issue of Chemical Industries (pages 811-824) in an article entitled Synthetic Detergents by John W. McCutcheon and also in the July, August, September, and October 1952 issues of Soap and Sanitary Chemicals under the title Synthetic Detergents. The disclosures of these articles with respect to surfactants are incorporated in this specification by reference in order to avoid unnecessary enlargement of this specification. The preferred surfactants are the water-soluble anionic non-ionic sur face-active agents set forth in US. Pat. No. 2,846,398 (issued Aug. 5, 1958). In general, a mixture of watersoluble anionic and water-soluble non-ionic surfactants is preferred.

The compounds of this invention can be dispersed by suitable methods (e.g. tumbling or grinding) in solid extending agents either of organic or inorganic nature and supplied to the insect pests environment in particulate form. Such solid materials include for example, tricalcium phosphate, calcium carbonate, kaolin, bole, kieselguhr, talc, bentonite, fullers earth, pyrophillite, diatomaceous earth, calcined magnesia, volcanic ash, sulfur and the like inorganic solid materials as well as organic materials such as powdered cork, powdered wood, and powdered walnut shells. The preferred solid carriers are the adsorbent clays, e.g. bentonite. These mixtures can be used for insecticidal purposes in the dry form, or by addition of watersoluble surfactants or wetting agents, the dry particulate solids can be rendered wettable by water so as to obtain stable aqueous dispersions or suspensions suitable for use as sprays.

For special purposes the compounds of this invention can be dispersed in a semi-solid extending agent such as petroleum or soap (e.g. sodium stearate or oleate or palmitate or mixtures thereof) with or without the aid of solubility promoters and/or surfactants or dispersing agents.

In all of the forms described above the dispersions can be provided ready for use in combatting insect pests or they can be provided in a concentrated form suitable for mixing with or dispersing in other extending agents. As illustrative of a particularly useful concentrate is an intimate mixture of a compound of this invention with a water-soluble surfactant in the weight proportions of 0.1 to 15 parts of surfactant with sufficient phosphonate to make parts by weight. Such a concentrate is particularly adapted to be made into a spray for combatting various forms of insect pests by the addition of water thereto.

Another useful concentrate adapted to be made into a spray for combatting a variety of insect pests is a solution (preferably as concentrated as possible) of a compound of this invention in an organic solvent therefor. The said liquid concentrate preferably contains dissolved therein a minor amount (e.g. 0.5 to 10 percent by weight of the weight of the new insecticidal agent) of a water-soluble surfactant (or emulsifying agent).

Emulsifiable concentrates of this general type are particularly well adapted for use as sheep and cattle dips in the control of animal parasites. in preparing such dips, a compound of this invention is dissolved in a water-immiscible solvent system and a sufficient quantity of one or more emulsifying agents is added to insure the formation of a stable aqueous emulsion. Water is then added to the concentrate to form an emulsion containing from about 0.01 to about 0.5 percent of the active ingredient.

Of the surfactants aforementioned in preparing the various emulsifiable, wettable or dispersible compositions or concentrates of this invention, the anionic and non-ionic surfactants are preferred. Of the anionic surfactants, the particularly preferred are the well known water-soluble alkali metal alkylaryl sulfonates as exemplified by sodium decylbenzene sulfonate and sodium dodecylbenzene sulfonate. Of the non-ionic surfactants. the particularly preferred are the water-soluble polyoxyethylene derivatives of alkylphenols (particularly isooctylphenol) and the water-soluble polyoxyethylene derivatives of the mono-higher fatty acid esters of hexitol anhydrides (e.g. sorbitan). These materials in general contain to 30 moles of ethylene oxide per mole of the hexitol anhydride or the alkylphenol.

The compositions of this invention can also contain other additiments such as fertilizers and pesticides used as, or in combination with, the carrier materials. For example, the pesticides listed in US. Pat. No. 3,393,990 starting at line 68, column 7 and extending through line 71 of column 8, can be used in combination with the above described compounds.

In controlling or combatting insect pests the compounds of this invention either per se or compositions containing them are supplied to the insect pests or to their environment in a lethal or toxic amount. This can be done by dispersing the new insecticidal agent of insecticidal composition comprising same in, on or over an infested environment or in, on or over an environment the insect pests frequent, e.g. agricultural soil or other growth media or other media infested with insect pests or attractable to the pests for habitational or sustenance or propagational purposes, in any conventional fashion which permits contract between the insect pests and the compounds of this invention. Such dispersing can be brought about by applying sprays, dips or particulate solid compositions to a surface infested with the insect pests or attractable to the pests as for example, animals such as sheep and cattle. the surface of an agricultural soil or other media such as the above ground surface of plants by any of the conventional methods, e.g. power dusters, boom and hand Sprayers, and spray dusters. Also for sub-surface application such dispersing can be carried out by simply mixing the new insecticidal agent per se or insecticidal spray or particulate solid compositions comprising same with the infested environment or with the environment the insect pests frequent. or by employing a liquid carrier for the new insecticidal agent to accomplish subsurface penetration and impregnation therein.

While this invention has been described with respect to certain embodiments, it is to be understood that it is not so limited and that variations and modifications thereof obvious to those skilled in the art can be made without departing from the spirit and scope thereof.

What is claimed is:

l. A compound of the formula wherein R is alkyl or alkylamino of a maximum of 6 carbon atoms,

R, R and R are hydrogen or alkyl of a maximum of 4 carbon atoms,

R and R can together form an alkylene group of 3 through 6 carbon atoms,

and n is an integer from 0 through 2.

2. A compound in accordance with claim 1 in which R and R are ethyl and R is hydrogen.

3. A compound in accordance with claim 1 in which R and R together form an alkylene group.

4. A compound in accordance with claim 3 in which the alkylene group has 4 carbon atoms.

5. A compound in accordance with claim 1 which is m-isopropylphenyl-N-( l-isobutenl -yl )-N- methylcarbamate.

6. A compound in accordance with claim 1 which is m-methylphenyl-N-( 1-cyclohexen-1-yl)-N- methylcarbamate.

7. A compound in accordance with claim 1 which is m-pentylphenyl-N-( l-isobuten-1-yl)-N- methylcarbamate.

8. A compound in accordance with claim 1 which is m-isopropylphenyl-N-( l-isopenten- 1 -y] )-N- methylcarbamate.

9. A compound in accordance with claim 1 which is m-pentylphenyl-N-(2-ethyl-l-hexen-1-yl)-N- methylcarbamate.

10. A compound of claim 3 in which n is 0 or 1 and,

when n is 1 R is in the meta-position.

UNITED STA'EES PATENT QFFTCE QETTFICATE {95F PATENT N0. 1 3,888,903

DATED 1 June 10, 1975 INVENTOR S John Paul Chupp It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, line 3, after "division" delete line 19, delete "or", second occurrence, and substitute therefor of Column 3, line 52, "bettles" should read beetles Column 4, line 35, "lbuten-l-yl) should read l-buten- -Y line 60, after "m-isopropylphenyl' delete Column 5, line 23, "are" should read as Column 7, line 42, "of" should read or line 49, "contract should read contact Column 8, Claim 2, line 2, "ethyl" should read methyl ancd and, this ninth @f September1975 [SEAL] Arrest:

RUTH C. MASON mnmr'sxr'uncr u/Parenls and Trademarks 

1. A COMPOUND OF THE FORMULA
 2. A compound in accordance with claim 1 in which R1 and R2 are ethyl and R3 is hydrogen.
 3. A compound in accordance with claim 1 in which R2 and R3 together form an alkylene group.
 4. A compound in accordance with claim 3 in which the alkylene group has 4 carbon atoms.
 5. A compound in accordance with claim 1 which is m-isopropylphenyl-N-(1-isobuten-1-yl)-N-methylcarbamate.
 6. A compound in accordance with claim 1 which is m-methylphenyl-N-(1-cyclohexen-1-yl)-N-methylcarbamate.
 7. A compound in accordance with claim 1 which is m-pentylphenyl-N-(1-isobuten-1-yl)-N-methylcarbamate.
 8. A compound in accordance with claim 1 which is m-isopropylphenyl-N-(1-isopenten-1-yl)-N-methylcarbamate.
 9. A compound in accordance with claim 1 which is m-pentylphenyl-N-(2-ethyl-1-hexen-1-yl)-N-methylcarbamate.
 10. A compound of claim 3 in which n is 0 or 1 and, when n is 1 R is in the meta-position. 